CN1171687A - Transmission rate judging unit - Google Patents

Abstract

A method and system is disclosed for determining an actual transmission rate of an encoded communication which has been transmitted at one of a plurality of transmission rates. An encoded communication is decoded at the plurality of transmission rates to generate decoded signals and decoding parameters which indicate the reliability of the decoded signals. One or more candidate transmission rates are identified based upon said decoding reliability parameters. If there is only one candidate transmission rate, the actual transmission rate is determined to be that candidate transmission rate. If there is more than one candidate transmission rate, the decoded signals are reencoded at the candidate transmission rates at which they were decoded. The bits of the communication are then compared with the bits of the reencoded signals for each candidate transmission rate to determine the actual transmission rate.

Description

Transmission rate judging unit

The present invention relates to a kind of digital communication receiver, relate to a kind of system and method for measuring the transfer rate of institute's frames received certificate in digital communication receiver or rather, this Frame is to transmit with the some transfer rates in many transfer rates of adding error correction coding.

The example of variable rate transmission system is few, with regard to the variable rate transmission system, does not transmit the signal that shows transfer rate in system particularly, so receiver also just can not get transfer rate by detecting the data that transmitted.The invention provides a kind of result as decoding processing measures transfer rate from the information that obtains system and method, the frame data that received are with this speed rates.

With reference now to Fig. 1, the transmission of variable bit rate is described.In the following description, the data transmission rate of a given frame supposes that in 1.2 kilobits/second, 2.4 kilobits/second change in 4.8 kilobits/second and 9.6 kilobits/second.The data volume that transmitter send according to tendency to develop and the characteristic of transmission channel are selected a transfer rate applicatory from 1.2kb/s among 2.4kb/s and the 9.6kb/s.Then, transmitter transmits data with selected transfer rate in passage.

The example that Fig. 1 represents is to constitute the method that a single frames transmits according to the variable rate transmission system.The legend of configuration frame data is a kind of typical case among Fig. 1, does not show any, special forcing method, and in the method, frame data that received offer transmission rate judging unit.

Shown in legend, in the variable rate transmission system, there is a regular time at interval as the Frame that is transmitted, i.e. " transmission frame width t _f" 181, no matter therein by data volume that selected transfer rate transmitted.Utilize the Frame of this fixed width just allow receiver at the same time a frame connect a frame ground handle data communication.

As shown in Figure 1, press the data of different transmission rate transmission, in the form of its arrangement, the interval of each bit that is transmitted or " width " are identical and change pro rata.For example, if transfer rate is the width 182 of its each bit of Frame of 9.6kb/s is a unit interval t, so, transfer rate is that each bit of 4.8kb/s just needs two unit interval 2t, 183, transfer rate is that each bit of 2.4kb/s just needs four unit interval 4t, 184, transfer rate is that each bit of 1.2kb/s just needs eight unit interval 8t, 185.

This example has been derived one about the corresponding relation by its instantaneous signal power of bit that different transmission rate transmitted.Promptly, because, its time interval length of bit that is transmitted by the 1.2kb/s transfer rate is the octuple of the time interval length of the bit that transmitted by the 9.6kb/s transfer rate, so, can transmit with the corresponding power level that reduces by the bit that transfer rate transmitted of 1.2kb/s.When for example, basic power level is 9.6kb/s 1/8th.Also correspondingly reduce with the bit of 2.4kb/s transmission and its power level of bit that transmits with 4.8kb/s.The power level that reduces to transmit when on lower transfer rate, transmitting, like this, also just having reduced transmitter power total in the transmission time uses, preserved the energy in the transmitter (promptly, the power of battery), reduced other are transmitted the interference of communicating by letter, increased the available channel number that uses simultaneously in the system.

When a receiver can not receive the signal that shows the communications rate always, this receiver must be determined transfer rate from transmitting data itself.As shown in Figure 1, when data transmitted with the speed that is lower than maximum rate 9.6kb/s, the data that arrive receiver can be regarded as and repeatedly transmitted.Therefore, with the data that speed was transmitted of 4.8kb/s well as if in the whole transmission time, be transmitted twice, the delivery time of the bit during of the time interval each time corresponding to 9.6kb/s speed.So the method for measuring actual delivery rate just can be considered to the time number that the determination data bit repeats to transmit.

As mentioned above, the power level of data transmission changes with different transfer rates.Yet we know in digital communication, and when the signal energy of each bit that transmits reduced, the bit error rate that receives transmission can increase.Therefore, in order to reduce to need the transfer rate that a system measures received communication measuring the error rate that transfer rate produces, system is seemingly in the increase of calculating the bit error rate that reduces to cause owing to transmitted signal energy in some sense.

Therefore, the purpose of this invention is to provide a kind of system and method, this system and method be used for accurately measuring institute's received communication actual delivery rate and no matter the variation of all possible transfer rate relative size, also no matter the size of the tag bit error rate of institute's received communication.

Further purpose of the present invention provides a kind of system and method and is used for accurately measuring the transfer rate of institute's received communication, and this method is at least partially based on the bit that contains transmitting error correction is carried out decoded results.

A further object of the invention provides a method that is used for accurately measuring the transfer rate of institute's received communication, the parameter that this method has utilized decoding processing to obtain, and these parameters have shown the reliability that the error correction coding signal is decoded.

A further object of the invention provides a kind of system and method, be used for accurately measuring the transfer rate of institute's received communication, this method is finished initial mensuration according to one group of threshold value to one or more candidates' transfer rate, and from several candidates' transfer rate, further finish mensuration to actual delivery rate, so transfer rate is determined comes out.

The present invention also has another class to provide a kind of system and method to be used for accurately measuring the transfer rate of institute's received communication, this method be based on will through institute's received communication of coding with institute's received communication decoded after again the result of coding make comparisons, all to do like this each of many candidacy transmission rates.

The present invention has another class to provide an improved cdma receiver system again, this system and system of the present invention and/or method combine the transfer rate of accurately measuring institute's received communication, and this method is at least partially based on one or more candidacy transmission rates being done initial mensuration.

The last class of the present invention provides a cdma receiver system, this system provides improved precision when measuring transfer rate, its method is to allow the threshold value that the precision that is used for decoding on transmission rate is done to measure is adjusted, the basis of adjusting is measured reception situation, comprises the intensity of multiplexing component.

Fig. 1 has represented the structure of the frame data of variable rate transmission.

Fig. 2 is the convolution coder example of structure.

Fig. 3-1 (a) has represented the grid chart of decoding to through 20 bit frame of convolutional encoding.

Fig. 3-1 (b) has represented to handle carrying out Veterbi decoding through 20 bit frame of convolutional encoding to Fig. 3-4 (1).

Fig. 4 is the example that transfer rate of the present invention is measured system block diagram.

Fig. 5 is the example that cdma receiver of the present invention constitutes.

Fig. 6 (a) shows that how digital information signal is by the discrete spectrum of pseudo noise code modulation with generation modulated information signal in a CDMA transmitter.

Fig. 6 (b) is illustrated in the multichannel component of controlled signal in the cdma receiver.

Fig. 7 is another example that cdma receiver of the present invention constitutes.

Reference number is defined as follows:

100 detected mark signals

101 bit decision equipment

102 Veterbi decoding equipment

103 threshold value judgment device

104 first transfer rate judgment device

105 transfer rate sensing equipments

106 convolutional encoding equipment

107 bit compare facilitieses

108 second transfer rate judgment device

109,110,111,112 synthetic bit signals

The final common path of 114,114,115,116 Veterbi decodings is measured

117,118,119,120 measure the threshold value of decoded result reliability

121,122,123,124 thresholdings are judged signal

125,126,127,128 decoded result signals

129,130,131,132 code signals again

133,134,135,136 results relatively

The signal of 137 controls 108

140 decoded results

142 transfer rates

The width t of 181 transmission frames _f

182 1 unit interval t, the width of formed frame bit when transfer rate is 9.6kb/s,

183 2 unit interval 2t, the width of formed frame bit when transfer rate is 4.8kb/s

184 4 unit interval 4t, the width of formed frame bit when transfer rate is 2.4kb/s

185 8 unit interval 8t, the width of formed frame bit when transfer rate is 1.2kb/s

200 detected analog signals

201 moduluses (A/D) conversion equipment

202,203,204 compressive shrinkage machines

205 homophase phase oil (gas) filling devices

206 transfer rate judgment device

207 detected digital signals

208,209,210 receiving symbol signals

211 synthetic detected symbol signals

220 decoded results

300 detected analog signals

301 moduluses (A/D) conversion equipment

302,303,304 compressive shrinkage machines

305 homophase phase oil (gas) filling devices

306 transfer rate judgment device

307 whole received power measuring equipments

308 transmission state predict device

309 threshold value sensing equipments

310 detected digital signals

The signal correction level of 311,312,313 expression detection power

314,315,316 restituted signals

317 synthetic restituted signals

318 close the inspection power signal

319 transmission state prediction signal

320,321,322,323 measure the threshold value of decoded result reliability

325 decoded results

327 transfer rate measured signals

The sequence input of 400 binary values

401 3 grades of shift registers

402,403 modulo 2 adders

404 sampling switch

The output of 405 sampling switch

601 digital information signals

603 pseudo noise codes

605 launch the spectrum modulating information signal

The first via multichannel component of 607 transmission signals

The second tunnel multichannel component of 609 transmission signals

The Third Road multichannel component of 611 transmission signals

613 inputs detect the numeral letter

Now, describe the transfer rate that is constituted according to first device of the present invention with reference to Fig. 4 and judge system.Transfer rate judgement of the present invention system is used in and measures already numeral in the receiver than the transfer rate of the frame data of code communication, wherein, transfer rate can be any one in many transfer rates, and it is to connect a frame ground by transmitter according to data volume one frame that is transmitted to select.When receiving, each frame is encoded already and the data demand that has an error correcting code is decoded in receiver.

During the Code And Decode of prepare describing was below handled, the convolution code that will describe was the specific example of error correcting code, and the Viterbi that will describe (Viterbi) decoding is the specific example of suitable decoding processing.Yet the skilled person in the present technique field will recognize that the system of use specific coding as described herein and decoding technique is also unrestricted in application.

The encoding process of finishing with convolution code is at first described.Fig. 2 has represented the structure of a general convolution coder.In Fig. 2, reference number 401 is three grades of shift registers, and it receives the sequence input 400 of binary value " 1 " or " 0 ".In the beginning of each clock, sequence input 400 first order that are timed into shift register, simultaneously, in the content right shift of previous each grade of clock period.After the operation that will show was finished below, the content of each of shift register grade was shifted and regularly goes into back to back next stage.

Reference number 402 is modulo 2 adders, and it carries out mould 2 to the content of the content of the title bit register first order 51 and shift register second level S2 and third level S3 and adds.Reference number 403 is modulo 2 adders, and it carries out mould 2 to the content of the first order S1 of shift register 401 and third level S3 and adds.Here, nodulo-2 addition refers to addition algorithm, and promptly when the number of input " 1 " was odd number, adder was exported a numeral " 1 ", and under other all situations, digital " 0 " of adder output.When each bit sequentially appearred in shift register 401 inputs, sampling switch 404 was used to provide the sequence output of 2 bits, and it comprises the output of modulo 2 adder 402 and the output of modulo 2 adder 403.The output 405 of 404 switches of sampling has just formed the coding output of convolution coder.

The operation of convolution coder shown in Figure 2 is described now, here, the situation when describing digital information flow length that every frame is input to convolution coder and being 10 bits.Before beginning coding, each level of shift register 401 is reset to binary value " 0 ".That is, S1=" 0 ", S2=" 0 ", S3=" 0 ", wherein, S1, S2, S3 are the contents of shift register 401 each grades.As an example, the supposition of 7 bit streams of digital information bits is " 1001110 ".In addition, binary value is the end that 3 bit streams of " 0 " are placed on 7 bit information flow, and it is used for these frame 7 bit information flow and finishes the three progressive horizontal resets of coding back to shift register 401.Therefore, the whole bit information flow that sequentially is input to shift register 401 is 10 bit one frames: " 1001110000 ".

The 1st bit of ten bit frame is binary value " 1 ", and it is input to after the shift register 401, and the content of shift register 401 will become S1=" 1 ", S2=" 0 ", S3=" 0 ".Therefore, the output of modulo 2 adder 402 becomes " 1 ", and the output of modulo 2 adder 403 also becomes " 1 ".As a result, the sample 2 bits output 405 of 404 switches just becomes convolution code output " 11 ".Subsequently, when second bit was input to shift register 401, the content of shift register 401 just became S1=" 0 ", S2=" 1 ", S3=" 0 ".The synthetic output of modulo 2 adder 402 becomes " 1 ", and the output of modulo 2 adder 403 becomes " 0 ".So the convolutional encoding output 405 of sampling switch 404 becomes " 10 ".

After the 3rd bit (binary value " 0 ") was input to shift register 401, the content of shift register 401 became S1=" 0 ", S2=" 0 ", S3=" 1 ".The synthetic output of modulo 2 adder 402 becomes " 1 ", and the output of modulo 2 adder 403 becomes " 1 ".Therefore, the output of the convolution code of sampling switch 404 becomes " 11 ".

Because coding, ten bit information flow have become 20 bit encoded stream, and ten unnecessary bits are arranged.Therefore, the convolution code of convolution coder (Fig. 2) output 405 is counted as 20 bits of encoded output streams, and its binary value is " 11101111011001110000 ".

Now, to Fig. 3-4, the principle of Veterbi decoding is described with reference to Fig. 3-1.Grid chart shown in Fig. 3-1 (a) has been represented the decoding to 20 bit convolution coded frame, and the binary value of these 20 bits is " 11101111011001110000 ".

In order to handle by Viterbi decoded in each position of convolutional encoding frame, in receiver, decoder must have a decoding model in advance, and is represented as the grid chart of Fig. 3-1 (a).At Fig. 3-1 (a) to the grid chart shown in Fig. 3-4 (1), symbol " 0 " expression node, solid arrow and dotted arrow represent the to decode branch road of path.State 0 to 3 shown in interval a to j shown in the abscissa and the ordinate has been represented the communication section that moves along the grid branch road from node-to-node.

For the error correcting capability of convolution code is described, the Veterbi decoding principle that will describe has a special reference, that is, it is to have 2 to make mistakes to advance afterwards in transmission that 20 bit streams of above-mentioned convolutional encoding are decoded.Mistake appears at the 2nd and the 5th of 20 bit streams.

Coded frame during transmission is: " 11101111011001110000 "

Coded frame during reception is: " 10100111011001110000 "

Press Viterbi and handle, during the decoding beginning coded-bit in the received frame is divided into one section of 2 bit, one section of 2 bit ...

Coded frame during reception is: " 10 ", " 10 ", " 01 ", " 11 ", " 01 ", " 10 ", " 01 ", " 11 ", " 00 ", " 00 ".

In the interval a to j of figure shown in-1 (a), in the frame that is received each 2 bit section that link to each other go with grid chart in corresponding another 2 bit sequences of each branch road compare.For example, during the decoding beginning, the 1st to 2 bit section " 10 " of 20 bit frame sequence " 00 " corresponding with the solid arrow branch road compares.Also corresponding with the dotted arrow branch road sequence " 11 " of the 1st 2 bit section " 10 " of 20 bit frame compares, and these two branch roads only are the interval a branch roads of time in a moment.Be easy to see that bit value does not all match for the 1st 2 bit section and two branch roads of the frame of " 10 ".Yet, need calculate the number of different bits between the bit sequence of 2 bit section receiving and the corresponding branch road of grid chart in this step content of decoding processing.Be called Hamming distance for each 2 comparative result that bit section obtained receiving.Give an example: the Hamming distance between bit sequence " 01 " and " 11 " is 1, and the Hamming distance between bit sequence " 11 " and " 11 " is 0.Skilled person in the present technique field will recognize that other method is calculated the distance between the different bit sequences, for example euclidean distance in addition.

After the several sections branch roads along the decoding model of frame calculate Hamming distance through several intervals, just in several possible paths, select a decoding road as survival path (model has minimum accumulation Hamming distance) along the branch road of model.For example, each among Fig. 3-1 (a) after the c of interval its branch road that is input to each node at interval has two, and we select wherein have a branch road of less accumulated value to be used as the branch road of surviving.This select to be handled heavily to become along the length of whole decoding model and carries out, so that produce a survival path by model.

Then, the mat bit value determines decoded result.The continuous branch road of the model that finds in this bit value and the survival path is corresponding, therefore also just with the frame of coded-bit between minimum to accumulate the Hamming distance path corresponding.For example, in Fig. 3-1 (a), for one 2 bit frame section, every dotted arrow branch road is corresponding with decoded result " 1 ", and every solid arrow branch road is corresponding with decoded result " 0 ".

Decoding processing is from the node on Fig. 3-1 (a) left side.Obtain in the 1st section " 10 " of the frame that received and the grid chart Hamming distance between the bit sequence of every branch road of a at interval.In a of interval, the 1st section " 10 " of institute's received frame and the Hamming distance between the branch road " 00 " are 1, and the Hamming distance between " 10 " and " 11 " also is 1.Therefore, at the end of interval a, the accumulated value of Hamming distance is 1 on the node of state 0, and the Hamming distance accumulated value also is 1 on the node of state 1.This result is expressed as accumulated value " 1 " and " 1 ", as representing in the square frame on state 0 node among Fig. 3-1 (b) and state 1 node.The value of these two accumulation Hamming distances can be measured along the path of the potential decoding path of decoder grid chart with reference to conduct.

Then, on every branch road of interval b, obtain Hamming distance, and the path of every path is measured and is corrected for the next frame section " 10 " of 20 bit frame.In the b of interval, frame section " 10 " that is received and the Hamming distance between the branch road " 00 " are 1.Similarly, frame section " 10 " that is received and the Hamming distance between the branch road " 11 " are 1, and the Hamming distance between " 10 " and " 10 " branch road is 0, and the Hamming distance between " 10 " and " 01 " branch road is 2.Therefore, shown in Fig. 3-1 (c), in the end of a period of interval b, the path that the node of state 0 obtains is measured and is become ' 2 ', and this is the result that Hamming distance 1 and the path of previous node of at interval b measured ' 1 ' addition.Equally, the path of state 1 node is measured and is become ' 2 ', and the path of state 2 nodes is measured and become ' 1 ', and the path of state 3 nodes is measured and become ' 3 '.

By this, interval a with at interval have only a branch road to be connected in the b with the node of end of a period at interval.But, from interval c begin and follow-up each at interval, always have two branch roads to be connected in each end of a period at interval with node, under all situations all like this.Therefore, after the c of interval, entering in two branch roads of each node has the selected survival path of that branch road of measuring than cat walk.So the processing of ' selecting in two branch roads ' just has been done before entering each connected node, and according to the result, another branch road is dropped.But, measure identical the time when the path of two branch roads, these two branch roads can be selected one arbitrarily and be used as the path of surviving.

Then see this example: shown in Fig. 3-1 (c), for a frame section " 01 " that is received, computing mode 0 is to each node of state 3 and the Hamming distance of every branch road once more.Shown in Fig. 3-1 (c), Hamming distance between frame section " 01 " and the branch road bit sequence " 00 " is 1, the Hamming distance of comparing through special sequence " 11 " with branch road is 1, and the Hamming distance of comparing with branch road bit preface " 10 " is 2, and the Hamming distance of comparing with branch road bit sequence " 01 " is 0.Therefore, decoding processing obtains a decoding path, and its path of branch road of linking to each other of path is measured and is ' 3 ' and ' 2 ' therewith on the node of state 0.In these two branch roads, the branch road of measuring to ' 2 ' along path is selected as the survival path.In like manner, its path of branch road that decoding processing connects on the node of state 1 is measured and is ' 3 ' and ' 2 ', and the selection path is measured to ' 2 ' branch road and made the survival path.

Continue decoding processing, to the node of state 2, its path of the branch road that is attached thereto is measured and is ' 4 ' and ' 3 ', and the selection path is measured to ' 3 ' branch road and made the survival path.For the node of state 3, its path of the branch road that is attached thereto is measured and is ' 2 ' and ' 3 ', and the selection path is measured to ' 2 ' branch road and made the survival path.Select the result who handles to be illustrated on Fig. 3-2 (d).

Here, please note: state 0 node shown in Fig. 3-2 (d) at the end of a period place picture of interval b a solid stain.As diagram, there is not branch road to send out from this node to next node.This shows, by the decoding nonpassage of this node.Therefore, all branch roads that link to each other with state 0 node that indicates stain eliminate from our consideration.These results are reflected among Fig. 3-2 (e).

At last, by above-mentioned description, the result who continues decoding processing is: have only one to be left with the corresponding path of sequences of code bits in the frame.2 bit section that 20 bit frame of receive are stayed carry out its state representation that enters continuously of decoded results at Fig. 3-2 (f) to Fig. 3-4 (1).Here three 2 bit section know that for a long time their value is " 00 " after note that the coding flow, because they are corresponding with last three bits of the signal of precoding, are used for carrying out displacement to the shift register 401 of convolution coder is at different levels.Because the decoder that is constituted has (knowing for a long time) coding principle to move earlier by these, so decoder is selected a decoding path, obtain just decoded last three 2 bit section than path, its binary value is " 0 ".Therefore, in the interval of grid chart h, interval i and interval j, have only solid arrow to link some nodes down, represented the decoding of " 0 " value.

Shown in Fig. 3-4 (1), Veterbi decoding is handled the automatic selection that obtains having only a survival path.The continuous branch road institute characterization of surviving that each stays at interval from left to right on the logical routing diagram.Therefore, the survival path and each bar branch road be successively: " dotted arrow ", " dotted arrow ", " solid arrow ", " solid arrow ", " solid arrow " and " solid arrow ".Just as described above, solid arrow is corresponding with decoded result " 0 ", and dotted arrow is corresponding with decoded result " 1 ", so, the complete decoded result of frame is become " 1001110000 ".The research decoded result can recognize that no matter receive the mistake that is produced in 20 bit frame of input, this decoded result is faultless, thereby by decoding processing, same ten information bits that transmitted are obtained once more.

Obviously find out that from top description Veterbi decoding is handled each frame of bit or partial frame are produced a decoded result and measure parameter about the path of decoded result.Below, measure parameter with the corresponding path of last decoded result and be looked at as last path and measure.In above-mentioned example, last path measurement value is 4.

From the above description that Veterbi decoding is handled, obviously, last path is measured the reliability of having represented the Veterbi decoding result.Certainly, last path measurement value is more little, and the reliability that Veterbi decoding is handled is high more.

Describe the transfer rate that constitutes according to the present invention now and measure system, therebetween by above-mentioned about convolutional encoding and the description of Veterbi decoding technique background.Receiver is received communication, its transfer rate according to transmitter in one group of predetermined transfer rate selection and change 1.2kb/s for example, 2.4kb/s, 4.8kbs, 9.6kb/s.When receiving, communication is the sequence of numerical data convolutional encoding frame, and these sequences can be handled to resemble and decode described above by Veterbi decoding.

Fig. 4 is the block diagram that the transfer rate of the formation according to the present invention is measured system.With reference to Fig. 4, the desire inspection mark signal 100 of desiring the detected transmission frame is input to bit decision equipment 101, and judgment device 101 merges continuous symbol according to the number (this number is corresponding with each transfer rate) that bit repeats.Bit decision equipment 101 also comprises: each value that makes up continuously to repetition bits on each transfer rate of different transmission rate is measured.The resultant current of bit decision becomes the synthetic bit signal 109,110,111 and 112 on each transfer rate from 101 outputs of bit decision equipment, and these transfer rates are 1.2kb/s, 2.4kb/s, 4.8kb/s and 9.6kb/s.

Bit decision equipment 101 can constitute finishes the bit decision processing, and two kinds of method form the basis are arranged, and a kind of is hard judgement, and another kind is a soft-decision, and bit value all is provided.Finish in the system of decoding according to the Viterbi method of Hamming distance based on the comparison, as described above, it is suitable that the bit decision method of the hard decision of bit value is provided.But the Viterbi method is finished in the system of decoding in several according to Europe based on the comparison, be with the bit decision method of the soft-decision that bit value is provided.

Provide the bit decision operation of hard decision to measure according to the following rules:

The value that has for symbol is after adding " 0 " or the value more than " 0 ", then this symbol is measured as and has binary value " 1 ", for the value that symbol had is after adding the value that is lower than " 0 ", and then this symbol is measured as and has binary value " 0 ".

Veterbi decoding equipment 102 receives synthetic bit signal 109 to 112 and they handled with Viterbi and decode, and each signal is all according to separately transfer rate.Then, by the result of the Veterbi decoding equipment 102 output decoded result signal 125,126,127 and 128 as each transfer rate, these each transfer rates are 1.2kb/s, 2.4kb/s, 3.8kb/s and 9.6kb/s.Veterbi decoding equipment 102 is output signal 113,114,115 and 116 also, and their expressions are finished the resulting final common path of decoding from each transfer rate and measured.

The first transfer rate judgment device 104 comprises a threshold value judgment device 103.Threshold value judgment device 103 receives that from Veterbi decoding equipment final common path measures signal 113,114,115 and 116 and finish the initial mensuration of decoded result reliability on each transfer rate.The thresholding judgment device is received and measure the threshold value 117,118,119 and 120 that the decoded result reliability is provided on each transfer rate.By signal 113,114, the final common path of 115 and 116 expressions is measured the threshold value 117 with each transfer rate, 118,119 and 120 make comparisons, result as a comparison, thresholding judgment device 103 provides thresholding to judge signal 121,122,123 and 124, whether the threshold value of these signal indications tested transmission rate under each situation is exceeded.

Threshold value signal 117,118,119 and 120 can be arranged to fixed value or be arranged to semifixed value with adjusting utensil with the hard-line connector tool, and these can adjust utensil for example can store threshold value with switch or the non-volatile annunciator of depositing.In addition, the threshold value of each transfer rate can mat appended sequence logical row logic OR microcode or mat dynamically measure according to existing decode operation result's software utensil.So the threshold value of being measured can be used as input signal 117,118 like this, 119 and 120 deliver to threshold value judgment device 103 and thereby can connect frame ground change by a frame.

Transfer rate sensing equipment 105 is measured its transfer rate to each frame data of receiving.Threshold value is judged signal 121,122,123 and 124, as mentioned above, provides the initial mensuration of decoded result reliability " OK " on the transfer rate of each expection.Judge that a specific threshold value on the signal 121,122,123 or 124, thresholding surpasses the result and represents with value " 0 ".Threshold value is judged signal 121,122, if have only a signal indication in 123 or 124 for being lower than thresholding result (" 1 " occurring), so, with be lower than the corresponding transfer rate of thresholding result and will 142 represent by output, and, signal 125, corresponding decoded result signal will be gone into decoded result output line 140 by transfer rate sensing equipment 105 gates in the middle of 126,127 and 128.But if threshold value is judged the signal of representing in the signal 121,122,123 and 124 to be lower than the thresholding result more than one, so, for the information of the transfer rate of measuring institute's frames received certificate is provided, the transfer rate judgment device will provide further equipment.

Transfer rate judges that system also comprises one second transfer rate judgment device 108, so that during more than one, provide the further information of measuring transfer rate as the operating result of the first transfer rate judgment device 104 identifying candidacy transmission rate by transfer rate sensing equipment 105.Under the simplest situation, candidacy transmission rate is identical, respective signal 121,122, its thresholding judgment value of 123 and 124 transfer rate all is " 1 ", but in order to select candidate's transfer rate in the speed that equals " 1 " in the thresholding judgment value, transfer rate sensing equipment 105 can be added equipment and further constitute.The second transfer rate judgment device combines convolutional encoding equipment 106 and bit compare facilities 107.Convolutional encoding equipment 106 is used for the decoded result output contravariant of vierbi decoding device 102 is become the convolution sequences of code bits.The output of the coding again of encoding device 106 is provided to as signal 129,130,131 and 132, these signals are respectively at 1.2kb/s, 2.4kb/s, on 4.8kb/s and the 9.6kb/s transfer rate by row coding again.

Bit compare facilities 107 has been received the synthetic bit signal 109,110,111 and 112 as input, and they are corresponding transfer rate 1.2kb/s, 2.4kb/s, 4.8kb/s and 9.6kb/s respectively.Bit compare facilities 107 also received as input, from the code signal again 129,130,131 and 132 of convolutional encoding equipment 106.Bit compare facilities 107 will synthesize bit signal 109,110, and 111 and 112 bit-rows is made comparisons on each transfer rate with the bit-rows of code signal 129,130,131 again and 132 so that obtain number statistical to the non-match bit of each transfer rate.Then, these number statisticals of bit compare facilities 107 output select these results to be used as the defeated rate of candidate on holding wire 137 as separately comparative result 133,134,135 and 136 on each transfer rate.

When using, the second transfer rate judgment device 108 is only to finishing above-mentioned operation by the candidacy transmission rate of transfer rate sensing equipment 105 appointment on holding wire 137.If what the second transfer rate judgment device 108 was received is not the candidacy transmission rate of signal 137 appointments, so, 108 inoperation of the second transfer rate judgment device.

But, when threshold value is judged signal 121,122,123 and 124 select more than 1 for the represented candidacy transmission rate of the frame that is received, and transfer rate sensing equipment 105 just signals by holding wire 137 to the second transfer rate judgment device 108 and synthesizes bit signal 109 so that finish by holding wire 137 so, 10,111,112 and code signal 129,130 again, 131,132 comparisons on each selected candidacy transmission rate.In this case, convolutional encoding equipment 106 is used for the Veterbi decoding signal encoding on 126 and 128 the candidacy transmission rate at decoded signal 125,126 again.Then, bit compare facilities 107 with on the bit-rows of each synthetic bit signal on the candidacy transmission rate and the candidacy transmission rate each again the bit-rows of code signal make comparisons, each synthetic bit signal is made comparisons with code signal again on by holding wire 137 selected same candidate transfer rates at transfer rate sensing equipment 105.Bit compare facilities 107 provides normalized bit relatively to export 133,134,135 and 136, they represented after normalization the bit-rows of synthetic bit signal and again between the code signal on each candidacy transmission rate the number of non-match bit.

With the bit number normalization of non-coupling, its method is that the determined constant of the proportionate relationship between these numbers and the candidacy transmission rate is multiplied each other to the bit compare facilities on each candidacy transmission rate.For example, if candidacy transmission rate is 1.kb/s and 9.6kb/s, normalized finishing is that number with candidacy transmission rate 1.2kb/s goes up non-match bit takes advantage of 8, and the number of non-match bit takes advantage of 1 on candidacy transmission rate 9.6kb/s.Skilled person in the present technique will know, and can finish normalized method has many kinds, for example, non-match bit all on all transfer rates is kept count of and multiply each other than ' 1 ' big constant.People also will recognize, when select ' 1 ' be used as with the corresponding non-match bit number of transmission rate (being 9.6kb/s) normaliztion constant the time, on the special number of the non-district of this transmission rate proportioning, just do not need to do multiplication.

Transfer rate sensing equipment 105 receives that normalized bit relatively exports 133,134,135 and 136 and select and the corresponding transfer rate of the non-match bit number of minimum normalization.Then, the transfer rate sensing equipment is gone up output decoder signal (output line is 140) as the decoded result to frame in selected transfer rate (decoded signal 125,126,127 and 128 middle choosings).Transfer rate sensing equipment 105 also provides a transfer rate 142 for the selection of received data frame.

The operation of judging system according to the transfer rate of first concrete device of the present invention is described now.Transfer rate judges that system can be used in the communication system, in this system, digital information in transmitter by error correcting encoder (as, the convolution coder of Fig. 2) coding.In the example of operation in this, each frame of data is encoded in 5 milliseconds frame period, and therefore working as transfer rate is 1.2kb/s, and the bit number of every frame is 6 bits, and when transfer rate was 2.4kb/s, the bit number of every frame was 12 bits.When transfer rate was 4.8kb/s, the bit number of every frame was 24 bits; When transfer rate was 9.6kb/s, the bit number of every frame was 48 bits.

Describing the example of transmitter coding operation now, is the situation of the frame selection 2.4kb/s transfer rate of a specific frame selection for transmitter, receives 12 information bits and goes to carry out convolutional encoding: " 101011101000 ".Adding behind last three bits " 000 ", as mentioned above, is to be used for convolution coder is resetted.

After 12 bit frame of digital information are encoded, just obtained the bit sequence and transferring out of accompanying on 2.4kb/s:

111000100001100100101100

As can seeing, if above-mentioned sequence bits detects on the speed at 9.6kb/s at coding on the speed of 2.4kb/s, the bit sequence that is transmitted or " bit-rows " have seemingly comprised such bit sequence so: every bit all has been repeated four times.Therefore, the above-mentioned bit sequence that transmits will be seen when detection on 9.6kb/s speed and make bit sequence as follows:

111111111111000000000000

111100000000000000001111

111100000000111100000000

111100001111111100000000

In order to provide bigger between the level of transmitted information, the difference transmitter becomes symbol " 1 " to the bits switch that binary system is not worth for " 1 ", and binary value is become symbol " 1 " for the bit permutation of " 0 ".Therefore, when detecting on the speed at 9.6kb/s, actual institute's transmission frame symbol row occurs as follows:

111111111111-1-1-1-1-1-1-1-1-1-1-1-1

1111-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-11111

1111-1-1-1-1?11111111-1-1-1-1-1-1-1-1

We supposed and establish the generation symbol error between transmission period during below simplification was described.Therefore, institute's information transmitted symbolic frame, promptly " symbol row " appears at the input that transfer rate is judged the bit decision equipment 101 of system.

Then, the symbol combination that bit decision equipment 101 different expection transfer rate handles are received forms synthetic bit signal 109,110,111 and 112.This operation is handled as two steps and is finished, and the first step is carried out addition to the symbol of being received on each transfer rate, in second step, on the basis of the plus signal that obtains, measures the value of the bit that receives.For example, if the transfer rate of expection is 1.2kb/s, finishes combination and be: eight symbols of receiving successively are one group, add up mutually, then, measure the sequence of institute's receiving symbol value on the basis of plus signal.For the transfer rate 2.4kb/s of expection, per four symbol additions of receiving successively form a plus signal.For transfer rate 4.8kb/s, per two symbol additions of receiving successively form a plus signal.By the combination that above-mentioned addition is handled, improved on bit energy to the ratio of noise energy than low transfer rate.Because in accordance with regulations, be maximum, so bit decision equipment 101 need not added up the symbol of received signal mutually in order to obtain the synthetic bit signal on the 9.6kb/s speed for its character rate that is transmitted of maximum transfer rate 9.6kb/s.Result below the aforesaid operations of bit decision equipment 101 has produced, between the anchor-frame of a frame 5 milliseconds, the maximum symbol quantity that comprises is 96 symbols.12 symbols of its symbol quantity of every frame of detected signal on expection transfer rate 1.2kb/s are 24 symbols to the speed of 2.4kb/s, are 48 symbols to the speed of 4.8kb/s, are 96 symbols to the speed of 9.6kb/s.

Suppose not produce mistake during the transmission that the symbol row after addition on the expection transfer rate 1.2kb/s becomes so:

8，0，-8，0，-8，0，0，0，-8，0，8，-8

Yet when received signal is addition on expection transfer rate 2.4kb/s, symbol row just becomes so:

4，4，4，-4，-4，-4，4，-4，-4，-4，-4，4，-4，

-4，4，-4，-4，4，-4，4，4，-4，-4

When received signal is addition on expection transfer rate 4.8kb/s, symbol row just becomes so:

2，2，2，2，2，2，-2，-2，-2，-2，-2，-2，2，2，

-2，-2，-2，-2，-2，-2，-2，-2，2，2，2，2，-2

-2，-2，-2，2，2，-2，-2，-2，-2，2，2，-2，-2

2，2，2，2，-2，-2，-2，-2

At last, when received signal is detected on expection transfer rate 9.6kb/s, symbol row just becomes so.

1，1，1，1，1，1，1，1，1，1，1，1，-1，-1，-1，-1，-1，-1，-1，-1，-1，-1，-1，-1，

1，1，1，1，-1，-1，-1，-1，-1，-1，-1，-1，-1，-1，-1，-1，-1，-1，

1，1，1，1，1，1，1，1，-1，-1，-1，-1，-1，-1，-1，-1，1，1，1，1，-1，-1，-1，

-1，-1，-1，-1，-1，1，1，1，1，-1，-1，-1，-1，1，1，1，1，1，1，1，1，-1，-1，

-1，-1，-1，-1，-1，-1，

After received signal and the addition of plus signal according to the expection transfer rate, bit decision equipment 101 measure each the sequence of the bit value of plus signal and output as the sequence of synthetic bit signal 109,110,111 and 112.

Therefore, on transfer rate 1.2kb/s, above shown in the synthetic bit signal 109 of institute's receiving symbol sequence be:

110101110110 (A)

On transfer rate 2.4kb/s, above shown in the synthetic bit signal 110 of institute's receiving symbol sequence be:

111000100001100100101100 (B)

On transfer rate 4.8kb/s, above shown in the synthetic bit signal 111 of institute's receiving symbol sequence be:

11111100000011000000001111

00001100001100111100 (C)

On transfer rate 9.6kb/s, above shown in the synthetic bit signal 112 of institute's receiving symbol sequence be:

111111111111000000000000

111100000000000000001111

111100000000111100000000

111100001111111100000000

Synthetic bit signal shown in top can see that the transfer rate that obtains synthetic bit signal is not the transfer rate of frame actual transmissions, and this has just caused very wrong mensuration.

Veterbi decoding equipment 102 is received synthetic bit signal 109,110,111 and 112 and they are decoded by the Veterbi decoding method, just as described above, obtain decoded result 125,126,127 and 128 and respectively at each transfer rate 1.2kb/s, 4.8kb/s9.6kb/s on final common path measure 113,114,115 and 116.Here, needn't describe the Veterbi decoding operation in detail, provide in this superincumbent description.As to synthetic bit signal decoded result (above be made as (A) in the back, (B), (C), (D)), Veterbi decoding equipment provides corresponding each transfer rate 1.2kb/s, 2.4kb/s, 4.8kb/s to thresholding judgment device 103,9.6kb/s final common path measure 113,114,115 and 116, their value is 2,0,7 and 12.

Thresholding judgment device 103 is the final common path measurement value normalization of receiving and judge which value whether exceed corresponding threshold value 117,118,119 and 120 in these values.Normalized finishing is that mat is multiplied by a constant with the final common path measurement value that obtains on each transfer rate, and this constant is to be determined by the proportionate relationship between transmission rate and the maximum transfer rate.For example, transfer rate maximum in this routine situation is set at 9.6kb/s, so, the final common path that obtains is measured that to finish normalization be that final common path is measured on duty 8 on the 1.2kb/s transfer rate.The final common path that obtains on the 9.6kb/s transfer rate is measured and is only taken advantage of 1, because 9.6kb/s is the highest transfer rate.Respectively for transfer rate 1.2kb/s, 2.4kb/s, 4.8kb/s and 9.6kb/s, the suitable normaliztion constant that is used for this example is 8,4,2 and 1.Therefore, press transfer rate 1.2kb/s in this example respectively, 2.4kb/s, its normalized final common path measurement value of signal of 4.8kb/s and 9.6kb/s decoding becomes 16,0,14 and 12.

Then, threshold value 117,118 in this example, 119 and 120 its each values of being set to " 5 " all.Here, clearly, the final common path measurement value that is obtained be the expection transfer rate on the decoding obtain rather than in the actual 2.4kb/s speed that is used to transmit, this value has all surpassed threshold setting value " 5 " under each situation.Threshold value judgment device 103 is measured signal 113 with each final common path, 114,115 or 116 go and corresponding threshold value 117,118,119 or 120 make comparisons on this transfer rate, if the normalized value that final common path is measured on the transmission rate does not surpass corresponding threshold value, then threshold value judgment device 103 is just exported thresholding judgment value " 1 ", and the decoded result of expression transfer rate has high reliability.The thresholding judgment value be output line on export, it is an output line in the corresponding output line 121,122,123 of transfer rate and 124 of decoded signal.

But if the normalized value that final common path is measured on the transmission rate has surpassed corresponding threshold value, so, threshold value judgment device 103 is just exported thresholding judgment value " 0 ", and the decoded result of expression transfer rate does not have high reliability.In the example here, threshold value judgment device 103 is at output line 121,122, and output thresholding judgment value is to each transfer rate 1.2kb/s on 123,124, and 2.4kb/s, 4.8kb/s, 9.6kb/s are respectively " 0 ", " 1 ", " 0 " and " 0 ".Skilled person in the present technique field will recognize that in order to finish more complicated calculating, the first transfer rate judgment device 104 can combine to reach the judgement of threshold value with additional logic.This additional logic can be finished by hardwired form, also can win victory fixing or non-volatile (even changeable) control storage is finished, as, can use ROM, PROM or EEPROM memory device are finished.

When thresholding judgment value " 1 " only appears at output line 121,122, in the time of on the output line in 123 and 124, transfer rate sensing equipment 105 is selected to be used as correct transfer rate with the corresponding transfer rate of certain threshold judgment value.Transfer rate sensing equipment 105 carries out gate in the mensuration of output speed on the output line 142 and to the decoded result of Viterbi decoder 102 on this transfer rate, output on output line 140.In this example, because thresholding judgment value " 1 " is to be that the final common path of the signal of 2.4kb/s decoding is measured for transfer rate only, so the mensuration of transfer rate becomes 2.4kb/s.The expression that transfer rate is measured provides on output line 142.In this example, all thresholding judgment value " 1 " of measuring its derivation as the final common path of decoding are the place of a corresponding transfer rate only, and the second transfer rate judgment device 108 is inoperative in transfer rate is measured.

But, in thresholding judgment device 103 output thresholding judgment value " 1 " is to measure under the situation that is foundation more than 1 transfer rate with the final common path that decoding obtains to obtain, and the second transfer rate judgment device 108 is finished further operation by " notice " so that help the transfer rate sensing equipment to measure the transfer rate of institute's frames received certificate so.Transfer rate sensing equipment 105 signals to the second transfer rate judgment device by line 137 and shows all candidacy transmission rates, and then transfer rate sensing equipment 105 is finished further operation so that the correct transfer rate of frame selection for receiving.

Describe the operation of the second transfer rate judgment device 108 now, in for example, the thresholding judgment value that transfer rate 1.2kb/s is appeared on holding wire 121 and 122 equals " 1 ", and does not have other transfer rate on holding wire 123 and 124.Judge that in threshold value transfer rate sensing equipment 105 provides a signal 137 to show that to the second transfer rate judgment device 108 candidacy transmission rate 1.2kb/s and 2.4kb/s are being differentiated on the basis of signal 121,122,123 and 124.

Then, 106 pairs of convolutional encoding equipment respectively the decoded result signal 125 and 126 that obtains on transfer rate 1.2kb/s and the 2.4kb/s encode again and online 129 and 130 on export again code signal and give bit compare facilities 107.The decode operation of being finished by Veterbi decoding equipment 102 intactly was described in the above, needn't give unnecessary details.Therefore, the decoded result 125 of institute's received frame becomes " 110000 " on the 1.2kb/s transfer rate, and the decoded result 126 of institute's received frame becomes " 101011101000 " on the 2.4kb/s transfer rate.

By the result that convolutional encoding equipment 106 is encoded to decoded result signal 125 and 126 on transfer rate 1.2kb/s and 2.4kb/s respectively again, produce again sequences of code bits (A ') and (B '), as follows:

“100101110000” (A′)

111000100001100100101100 (B’)

In this example, for each candidacy transmission rate 1.2kb/s and 2.4kb/s, bit compare facilities 107 is made comparisons the code signal again of the synthetic bit signal of bit decision equipment 101 and convolutional encoding equipment 106.In this example, transfer rate is the synthetic bit signal 109 of 1.2kb/s, and its value and above-mentioned (A) that is illustrated in the bit-rows is equal to.Bit composite signal 109 its value and top (A ') that are illustrated in the bit-rows are equal to.Equally, transfer rate is that the synthetic bit signal 110 of 2.4kb/s is equal to above-mentioned (B), and the output signal of encoding again 130 is equal to top (B '), and the two compares.

For each candidacy transmission rate, as the result of these two comparisons, bit compare facilities 107 produces the bit-rows of each synthetic bits and the statistics of non-match bit number between the code signal again.Therefore, concerning the transfer rate of 1.2kb/s, the synthetic bit signal (A) and the output signal (A ') of now encoding are:

“110101110110” (A)

“100101110000” (A′)

The number of non-match bit is 3.This number is construed to output to transfer rate sensing equipment 105 normalized statistics before.

Concerning the transfer rate of 2.4kb/s, the synthetic bit signal (B) and the output signal (B ') of encoding again are:

“111000100001100100101100” (B)

“111000100001100100101100” (B′)

The number of non-match bit is 0.This number is construed to output to transfer rate sensing equipment 105 normalized statistics before.

Then, the statistics to non-match bit is made normalized on each candidacy transmission rate.Normalized finishing is such: the non-match bit statistics of 1.2kb/s transfer rate takes advantage of 8, and the non-match bit statistics of 2.4kb/s transfer rate takes advantage of 4, if the 4.8kb/s transfer rate is arranged, then its non-match bit statistics takes advantage of 2.Normalized non-match bit is added up on online 133,134,135 and 136 and is exported to transfer rate sensing equipment 105.In this example, non-match bit statistics 133 its values of the normalization of 1.2kb/s transfer rate are " 24 ", and non-match bit statistics 134 its values of the normalization of 2.4kb/s transfer rate are " 0 ".

Transfer rate sensing equipment 105 selects to obtain the transfer rate of minimum non-match bit statistics.It is theoretical consistent with decoding to select transmission to call on this method, because theory shows, higher non-match bit is added up to like and caused owing to transmission is decoded on bad transfer rate.In this example, determined come out of 2.4kb/s transfer rate is judged result to the transfer rate of institute's frames received certificate.

In first preferred concrete foregoing description that installs of invention, the selection of convolutional encoding and Veterbi decoding and operation are to want as the typical case, rather than limit other method.The present invention does not limit the digital coding of any type, and for example convolution error correcting code does not limit Veterbi decoding too.Also have, unique requirement is that it is subordinated to a kind of coding/decoding method for the applicability of specific coding method of the present invention, and this coding/decoding method provides decoded result and the parameter of expression decoded result reliability is provided.

Describe the Code Division Multiplex that constitutes according to second concrete device of the present invention now and handle the formation and the operation (with reference to Fig. 5) of (CDMA) receiver.Cdma receiver is used in the communication system, and it allows transmitter to select transfer rate for transmitting a frame or multiframe data from one group of predetermined transfer rate.It is foundation with the amount of digital information that this communication system allows the selection of transfer rate, and this amount of information transmits in the given interval corresponding with frame time, and wherein, frame time remains constant and has nothing to do with transfer rate.The digital information that is transmitted in such cdma communication system is modulated with the error correcting code coding and for transmission, and method is to be multiplied by a pseudorandom discrete code.Multiplied result produces the discrete spectrum of the modulated signal that transmits in the transmission channel scope of medium, and typical medium is wireless, but also can be wired or light guide media.In order to utilize such cdma communication system, cdma receiver must be measured transfer rate to the frame data that each received, and this will collect feature bit by bit and accomplish from the detected data of institute's received frame.

The configuration example of the cdma receiver that constitutes according to the present invention is illustrated among Fig. 5.In Fig. 5, analog-to-digital conversion (A/D) equipment 201 is used for converting detected analog signal 200 to digital form, and output digital signal 207.Reference number mark 202,203 and 204 is demodulated equipments, also is called compressive shrinkage machines or finger-like circuit, is used for extracting the mark signal 208,209 and 210 that is received from the two or more different multichannel components of transmission signals.Demodulated equipment 202,203 and 204 extracts the symbol that is received, and method is that detected digital signal 207 is multiplied by identical spreading codes, and the phase place of this spreading codes is the same with the phase place that modulated transmission signal is used.The extraction of each demodulated equipment 202,203 and 204 pairs of symbols is to finish on the base when specific reception, and this time base is corresponding with the relative mistake of the multichannel component time of advent.Homophase phase oil (gas) filling device 205 is used for symbol 208,209 and 210 additions that will be received, calculates the different times of advent simultaneously and exports the result as synthetic detected mark signal 211.

The same in first concrete device of the formation of transfer rate judgment device 206 and top description the present invention, method of operation is also identical.Transfer rate judgment device 206 receives synthetic detected mark signal 211 as input, exports a signal 220 as judged result.Utilize synthetic detected mark signal 211, transfer rate judgment device 206 is according to the operation of the first transfer rate judgment device 105 or the second transfer rate judgment device 108, measure the transfer rate of institute's frames received certificate, these operate in the transfer rate judgment device 206 synthetic and as described above.Operate in this case, fixing threshold value 117,118,119 and 120 inputs that are used as the threshold value judgment device 103 of transfer rate judgment device 206 are suitable.

Second concrete operation of installing the cdma receiver that is constituted according to the present invention described now.In the following description, the detection signal of cdma receiver A/D conversion equipment 201 inputs supposes that it is on base band frequency.

Fig. 6 (a) has represented an example, and expression digital information signal 601 is how to be modulated by pseudo noise code 603 so that produce one to launch spectrum modulated information signal 605 and go transmission.Typically, launching spectrum modulated information signal will be because of transmission be moved toward transmission frequency in wireless or other wireless radio frequency transmissions media, and but, launching spectral technology can be used in other transmission mediums by the imagination.This frequency shifts technology is well-known, needn't give unnecessary details.

Under the wireless mobile communications environment, because object such as building, object artificial or nature or the like be to the reflection of transmission signals, the demultiplexing component takes place in transmission signals easily.Therefore, the transmission signals of receiving on mobile communication receiver is various multichannel component signal, and they arrive according to the relative length in the path of receiving multichannel component base when the different receptions.

Fig. 6 (b) has represented the example of the multichannel component of detection signal on cdma receiver modulus (A/D) conversion equipment 201 inputs.With in Fig. 6 (b), represent to do signal 607 for defeated signal first via multichannel component detection signal corresponding, that base arrives when receiving.Base arrives when receiving after a while, another detection signal corresponding with the second tunnel multichannel component represent to do signal 609.At last, Third Road detection signal corresponding with Third Road multichannel component, that base arrives when another postpones to receive represents to do signal 611.Detection signal 607,609, the variation of base when 611 synthetic result does not consider to receive promptly is that input detects digital signal 613 among Fig. 6.

Therefore, detect digital signal 207 and comprised many roads component, demodulated equipment 202,203 and 204 came demodulation individually when these components can be according to their separately receptions.The result of the demodulation process of being finished produces detected symbol signal 208,209 and 210.Then, detected symbol signal 208,209 with 210 in homophase homophase addition in the oil (gas) filling device 205 mutually, form a single composite signal 211, be input to transfer rate and judge system 206.After this, transfer rate judges that system 206 measures transfer rate according to the processing of crossing described in first concrete device of the present invention.Transfer rate is judged mensuration and the decoded result on this transfer rate of 206 these results of output of system as transfer rate.

(with reference to Fig. 7) constitutes cdma receiver according to the 3rd concrete device of the present invention example is described now.As shown in Figure 7, cdma receiver comprises that a modulus (A/D) conversion equipment 301 is used for converting detected analog signal 300 to detected digital signal 310.The base when phase place of the spreading codes that foundation is given and the reception corresponding with each multichannel component, a plurality of expansion spectrum demodulated equipments 302,303 and 304 are used for carrying out demodulation to being included in the multichannel component that detects digital signal 310.Demodulated equipment number shown in Figure 7 is 3, and the skilled person in the present technique field will recognize, increase gradually with the demodulated equipment number, and the performance of receiver is improved.Yet for obtaining an advantage from concrete device of the present invention described herein, only two demodulated equipments are essential.Demodulated equipment is called compressive shrinkage machines (despreading means) or " finger-like circuit " (" finser circuits "), and it is used for demodulation is carried out in the transmission that launches spectrum in the scope of receiver.

Demodulated equipment 302,303 and 304 produces demodulated output signal 314,315 and 316, comprises respectively and the corresponding detected symbol stream of each multichannel component that enters transmission.Demodulated equipment 302,303 and 304 also provides output 311,312 and 313, has represented to characterize in each restituted signal 314,315 and 316 the signal correction level of detection power.Synthesis device 305 is used for restituted signal 314,315 and 316 base to their separately receptions the time is carried out addition after being adjusted, so that produce a synthetic restituted signal 317.

As first concrete device of the present invention described above, cdma receiver also comprises a transfer rate judgment device 306.Transfer rate judgment device 306 is received synthetic restituted signal 317 and difference correspondence transfer rate 1.2kb/s separately, 2.4kb/s, 4.8kb/s and the threshold value 320 of 9.6kb/s, 321,32 and 323 as input, it produces 325 and transfer rate measured signals 327 of a decoding output, as above-mentioned transfer rate judgment device.

Cdma receiver is further provided with whole received power measuring equipments 307 and is used for producing a full inspection power signal 318, and * represents to detect the size of whole power in the digital signal 310.Transmission state predict device 308 is according to input: examine power signal 318 and sensed power 311,312 and 313 entirely and be used to provide a transmission state prediction signal 319.Transmission state predict device 308 measure transmission states be mat calculate by each sensed power 311,312 and 313 represented signal powers with by the prediction recently of the power of full inspection power signal 318 expressions.Then, the ratio of signal power is synthesized (for example, averaging) so that provide a transmission state prediction signal 319 to be used for being illustrated in the situation of timely dominant this transmission channel on the given point.

Threshold value sensing equipment 309 be used to provide one group independently, threshold value 320,321,322 and 323 that can be given, they are corresponding with each possible transfer rate, i.e. 1.2kb/s, 2.4kb/s, 4.8kb/s and 9.6kb/s, on these transfer rates, may receive frame data.Threshold value is measured according to the transmission state prediction signal of receiving from transmission state predict device 308 319 by threshold value sensing equipment 309.In order to measure multiplexing gate limit value 320,321,322 and 323, look-up table is considered a kind of in the suitable method of many kinds, expression provide many groups with the corresponding threshold value of transmission state prediction signal 319 different numerical value.

The operation of the cdma receiver that constitutes according to the 3rd concrete device of the present invention is described now.Detected baseband signal is input to A/D conversion equipment 301 from checkout gear, for example antenna and front end frequency tuning system.After the conversion, digital detection signal 310 input demodulated equipments 302,303 and 304, they carry out demodulation to each multichannel component that detects digital signal 310 and demodulated output signal 314,315 are provided and 316 give synthesis device 305.Sensed power 311,312 and 313 produce by a known processing from detecting digital signal 310, promptly by detect digital signal 310 multichannel component separately and pseudorandom spreading codes when their separately receptions on the base to the processing of relativeness between the phase bit.Then, synthesis device 305 after the base combines demodulation underriding signal 314,315 and 316 when the reception of adjusting separately, is input to transfer rate judgement system 306 so that produce a synthetic restituted signal 317.

All received power measuring equipments 307 also receive digital detection signal 310 and export full received power signal 318 expressions and are included in signal power in the transmission.The sensed power 311,312,313 of full received power signal and each multichannel component of corresponding transmission is input to transmission state predict device 308 one, exports thereby produce 319 conducts of a transmission state prediction signal.Then, threshold value sensing equipment 309 utilizes transmission state prediction signal 319 to go to measure, and judges that to transfer rate system 306 provides one group of threshold value 320,321,322 and 323 to be used for measuring transfer rate, receives the frame of detected symbol on this transfer rate.Then, the same method of transfer rate judgement system is operated in first concrete device of the above-described the present invention of transfer rate judgement system's 306 usefulness, so that transfer rate mensuration 327 of output and decoded result output 325 on this transfer rate.

Just as noted above, provide for dynamically adjusting according to the operation of the cdma receiver of this concrete device of the present invention, with the transmission state of response channel, the relative intensity of multichannel component for example.This adjustment is to make according to transmission state prediction signal 319 to select threshold value 320,321, and 322 and 323 finish, and signal 319 has been represented the relative intensity of the multiple signals component of transmission.

Above, according to determining that preferably specifically device has at large been described the present invention, wherein many corrections and change can be finished by the skilled person in the present technique field.Therefore, appended claims are intended to cover all such correction and changes, as long as it is to belong to true scope of the present invention and spirit.

Claims (24)

1. the assay method of its actual delivery rate of code communication that transmits with a transfer rate in a plurality of transfer rates, the step that comprises is as follows:

(a) on described a plurality of transfer rates, described code communication is decoded, produce a plurality of decoded signals;

(b) measure and the corresponding decoding reliability parameter of each described decoded signal;

(c) on the basis of described decoding reliability parameter, differentiate one or more candidates' transfer rate, decoded reliably at the above code communication of this or these transfer rate;

(d) from the full rate of described one or more candidates, measure actual transfer rate.

According to the process of claim 1 wherein if the number of candidacy transmission rate is 1, determined described actual delivery rate is exactly described candidacy transmission rate.

According to the process of claim 1 wherein if candidacy transmission rate outnumber 1, described actual delivery rate is measured by following steps:

(a) on each candidate's the transfer rate to described candidacy transmission rate in described decoding step decoded described decoded signal encode again;

(b) on each candidate's the transfer rate described candidacy transmission rate on again the coding communication code compare with described code communication;

(c) actual delivery rate of the described code communication of mensuration is exactly the immediate described transfer rate of comparative result.

4. according to the method for claim 3, wherein said comparison step comprises measures described code communication and the number of non-match bit between the above communication code of encoding again of described candidacy transmission rate.

5. according to the process of claim 1 wherein that more described thus decoding reliability parameter of described discriminating and threshold value finish.

6. according to the method for claim 5, wherein said threshold value is determined according to measured reception situation.

7. according to the method for claim 6, wherein said measured reception situation is determined by the received power of measuring in a plurality of multichannel components of described communication.

8. according to the method for claim 7, the wherein said measured situation that goes up is determined by whole received powers in the described code communication of measurement.

9. according to the method for claim 8, wherein said measured reception situation is recently determined by its described received power of at least one multichannel component in the described a plurality of multichannel components of calculating and described whole received power.

10. the system of the actual delivery rate of the code communication that transmits of a transfer rate that is used for measuring with a plurality of transfer rates comprises:

To the equipment that the described code communication on described a plurality of transfer rates is decoded, produce the decoding reliability parameter of a plurality of decoded signals and each described decoded signal;

Differentiate the equipment of one or more candidacy transmission rates, code communication is decoded reliably according to described decoding reliability parameter on this candidacy transmission rate;

From described one or more candidacy transmission rates, determine the equipment of described actual delivery rate.

11. according to the system of claim 10, wherein said sensing equipment comprises:

To each described decoded signal equipment of coding again on the same candidate transfer rate, decoded by described decoding device at the above decoded signal of this transfer rate;

With described coding more doubly with the equipment of comparing of described code signal;

Measure the equipment of described its described actual delivery rate of code communication according to the result of described comparison.

12. according to the system of claim 11, wherein said compare facilities is measured described code communication and the described number of non-match bit between the code signal again.

13. according to the system of claim 10, wherein said authentication equipment comprises the equipment of more described decoding reliability parameter and threshold value.

14., further comprise the equipment of measuring described threshold value according to measured reception situation according to the system of claim 13.

15. according to the system of claim 14, wherein said measured reception situation is to be foundation with received power in a plurality of multichannel components of measuring described code communication.

16. according to the system of claim 15, whole received powers are foundation to wherein said measured reception situation in the described code communication to measure.

17. according to the system of claim 16, wherein said measured reception situation is recently to be determined by the one or more of the described received power of calculating at least one multichannel component in described a plurality of multichannel components and described whole received power.

18. the expansion spectrum communication control processor of demodulation sign indicating number is carried out in a communication that is used for transmitting on the arbitrary transfer rate of a plurality of prediction transfer rates, comprising:

Each of a plurality of multichannel components of signal of communication is carried out a plurality of demodulated equipments of demodulation;

Equipment with described demodulation multichannel component synthesizes produces a synthetic restituted signal;

Measure the equipment of reception situation;

In order to measure the actual delivery rate that transmits described communication and on described actual delivery rate, to produce a decoding communication signals, respond the equipment of described synthetic restituted signal and described measured reception situation.

19., wherein further comprise for the equipment of measuring an actual delivery rate according to the communication control processor of claim 18:

To the equipment that described communication is decoded, produce the decoding reliability parameter of a plurality of decoded signals and corresponding each described decoded signal on described a plurality of transfer rates;

Differentiate the equipment of one or more candidacy transmission rates, according to described decoding reliability parameter, communication is decoded reliably on this transfer rate;

From described one or more candidacy transmission rates, measure the equipment of described actual delivery rate.

20. according to the system of claim 19, the equipment of wherein measuring described actual delivery rate from one or more candidacy transmission rates comprises:

To the equipment that each described decoded signal is encoded on same candidacy transmission rate again, each described decoded signal is decoded by described decoding device on this transfer rate;

With described code signal again and the described equipment of communicating by letter and comparing;

Measure the equipment of the described actual delivery rate of described communication according to described comparative result.

21. according to the system of claim 19, wherein said authentication equipment comprises the equipment that described decoding reliability parameter is compared with the threshold value of selecting on described measured reception situation basis.

22. according to the system of claim 18, the equipment that wherein said measurement receives situation is included in the equipment of measuring received power in each described multichannel component of described communication.

23. according to the system of claim 22, the equipment that wherein said measurement receives situation further comprises the equipment of measuring whole received powers in the described communication.

24. according to the system of claim 23, wherein said reception situation is recently measured by the one or more of the described received power of calculating at least one component in described a plurality of multichannel components and described whole received power.

Images